May Be Caused by

 Common

Fractured kidney

Hydronephrosis

Neoplasm of kidney

Nephrectomy

Obstruction of ureter

Renal artery obstruction

Renal artery stenosis

Renal artery thromboembolism

Renal cell carcinoma

Trauma

 Uncommon

Abscess

Acute bacterial nephritis

Acute focal bacterial nephritis

Arteriovenous malformation of kidney

Autonephrectomy

Congenital absence of kidney

Congenital hypoplasia of kidney

Lymphoma

Multicystic dysplastic kidney

Perinephric hematoma

Pyonephrosis

Radiation injury

Renal abscess

Renal vein obstruction

Tuberculosis

Xanthogranulomatous pyelonephritis